Abstract
Recently, an offshore support vessel is being widely used to install an offshore structure such as a subsea equipment which is laid on its deck. The lifting operation which is one of the installation operations includes lifting off, lifting in the air, splash zone crossing, deep submerging, and finally landing of the structure with an offshore support vessel crane. There are some major considerations during this operation. Especially, when lifting off the structure, if operating conditions such as ocean environmental loads and hoisting (or lowering) speed are bad, the excess of tension of wire ropes of the crane and the collision between the offshore support vessel and the structure can be occurred due to the relative motion between them. To solve this problem, this study performs the lifting simulation while the offshore support vessel installs the structure. The simulation includes the calculation of dynamic responses of the offshore support vessel and the equipment, including the wire tension and the collision detection. To check the applicability of the simulation, it is applied to some lifting steps by varying operating conditions. As a result, it is confirmed that the conditions affect the operability of those steps.
Highlights
The particular characteristics of an offshore structure are not like those of an onshore or near-shore structure
We developed an in-house program based on multibody system dynamics and the program was used for this simulation
The lifting simulation when the offshore support vessel (OSV) installs the offshore structure such as subsea equipment was performed in this study by varying operating conditions
Summary
The particular characteristics of an offshore structure are not like those of an onshore or near-shore structure. They estimated the motion of the floating crane and the offshore wind turbine, and calculated the tension acting on the wire ropes between the two. The studies mentioned above did not cover dynamic responses such as wire tension and collision, and various operating conditions such as ocean environmental loads and hoisting (or lowering) speed all for the steps of the lifting method.
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